Understanding AID Allocation for Non-AP MLDs in IEEE 802.11-20/0770r1
Explore the complex AID allocation rules for non-AP MLDs in the context of IEEE 802.11-20/0770r1. The document delves into issues related to AID assignment to legacy and non-AP MLDs, proposing solutions to ensure unique and reserved AID allocation for maximum efficiency in WLAN networks.
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4/28/2020 Doc.: IEEE 802.11-20/0770r1 MLO: AID Allocation Date: 2020-04-28 Authors: Affiliations Address Phone email Name Young Hoon Kwon Liwen Chu Manish Kumar Hongyuan Zhang Yan Zhang Rui Cao Sudhir Srinivasa Hui-Ling Lou NXP Submission Slide 1 Young Hoon Kwon et al (NXP)
4/28/2020 Doc.: IEEE 802.11-20/0770r1 Background Current consensus includes: A bit in a partial virtual bitmap of a TIM element that corresponds to a non-AP MLD is set to 1 if any individually addressed BUs for the non-AP MLD are buffered by the AP MLD. This implies that an AID is allocated to each non-AP MLD regardless of the number of links the non-AP MLD has set up. In this contribution, we study if there are any further restrictions needed on the AID allocation for non-AP MLDs. Submission Slide 2 Young Hoon Kwon et al (NXP)
4/28/2020 Doc.: IEEE 802.11-20/0770r1 Background Baseline AID allocation rule: AID 0 is used to indicate group addressed traffic. When a multi-BSSID is supported, AIDs from 1 to (2^n -1) are not allocated to a STA, where the maximum possible number of BSSIDs is an integer power of 2, n = log2 (maximum possible number of BSSIDs) The bits 1 to (2^n 1) of the bitmap are used to indicate that one or more group addressed frames are buffered for each AP corresponding to a nontransmitted BSSID and are called NonTxBSS identifiers. The NonTxBSS ID equals the value carried in the BSSID Index field of the Multiple BSSID-Index element carried in its nontransmitted BSSID profile. AIDs from 2^n to 2007 are allocated to STAs within any BSS corresponding to a transmitted or nontransmitted BSSID. Submission Slide 3 Young Hoon Kwon et al (NXP)
4/28/2020 Doc.: IEEE 802.11-20/0770r1 Issues Let us assume that AP1 and AP2 are affiliated with an AP MLD: AP1 supports multiple BSSID such that the maximum possible number of BSSIDs for AP1 is 2^n. AP1 can assign STAs AID chosen from 2^n to 2007. AP2 does not operate with a multiple BSSID set. AP2 can assign STAs AIDs chosen from 1 to 2007. If AIDs 1 to (2^n-1) are assigned to legacy or single-link STAs: In TIM element sent by AP2, these AIDs indicate buffer status of the STAs and there s no issue. If AIDs 1 to (2^n-1) are assigned to non-AP MLDs: In TIM element sent by AP2, these AIDs indicate buffer status of the non-AP MLDs and there s no issue. In TIM element sent by AP1, these AIDs are doubly defined for both non-AP MLDs and the nontransmitted BSSIDs. Submission Slide 4 Young Hoon Kwon et al (NXP)
4/28/2020 Doc.: IEEE 802.11-20/0770r1 Solution As AID is assigned to an MLD level: The AID assigned to a non-AP MLD shall be unique and shall be not reserved on any link An AID less than 2^n where n is the maximum value of the MaxBSSID Indicator in a multiple BSSID set is reserved In other words, if there are N configured links for an AP MLD: AIDs from 1 to max(2^n_1, 2^n_2, 2^n_N) - 1 are not allocated to a non-AP MLD, where the maximum possible number of BSSIDs on i-th link is an integer power of 2, n_i = log2(maximum possible number of BSSIDs on i-th link) Submission Slide 5 Young Hoon Kwon et al (NXP)
4/28/2020 Doc.: IEEE 802.11-20/0770r1 Operation example MLD1 includes 3 APs in 3 links (Link1/2/3). BSSID of AP1a on Link1 is transmitted BSSID and AP2b on Link2 and AP3c on Link3 ARE nontransmitted BSSIDs. The number of nontransmitted BSSIDs within a set of Multiple BSSID set on each link is different: AP1a: 1, AP2a: 3, AP3a: 3 AIDs from 1 to max(1, 3, 3)=3 are not assigned to a non-AP MLD by MLD1. AID = 2 & 3 still can be assigned to legacy STA or a single-link STA on link1. : transmitted BBSID Link1 AP1a AP1b : nontransmitted BBSID Link2 AP2c AP2b AP2a AP2d Link 3 AP3c AP3d AP3b AP3a : MLD1 Submission Slide 6 Young Hoon Kwon et al (NXP)
4/28/2020 Doc.: IEEE 802.11-20/0770r1 Summary Baseline AID allocation rule is extended to cover non- AP MLDs. Submission Slide 7 Young Hoon Kwon et al (NXP)
4/28/2020 Doc.: IEEE 802.11-20/0770r1 SP Do you support in TGbe SFD that The AID assigned to a non-AP MLD shall be unique and shall be set to a value greater than or equal to 2^n where n is the maximum value of the MaxBSSID Indicator amongst the multiple BSSID set(s) operating on any link of the AP MLD. Submission Slide 8 Young Hoon Kwon et al (NXP)
